Telegraphic type-printing receiver.



A. FRANKE & E. EHRHARDT.

TELEGRAPHIQ TYPE PRINTING RECEIVER. APPLICATION FILED Aums. 1911.

I E zz zzesses: I22 ve iw W a W? THE COLUMBIA PLANOURAPH cm, WASHINGTON, D. c.

UNITED STATES PATENT OFFICE.

ADOLF FRANKE, OF GRUNEWALD, AND ERWIN EHRHARDT, OF PANKOW, GERMANY, ASSIGNORS TO SIEMENS & HALSKE AKTIENGESELLSCHAFT, A. CORPORATION OF GERMANY.

TELEGRAPHIC TYPE PRINTING RECEIVER.

To all whom it may concern:

Be it known that we, ADOLF FRANKE and ERWIN EHRHARDT, subjects of the German Emperor, and residing, respectively, at Grunewald and Pankow, near Berlin, Ger many, have invented certain new and useful Improvements in Telegraphic Type-Pr nting Receivers, of which the following 1s a specification.

Our invention relates to telegraphm typeprinting receivers, inwhich the symbol to be printed is not formed by one single current impulse corresponding to one character, but by a combination of a'plurality of mpulses following one another lIISllCCGSSlOIl,

and in which the device for distributing the arriving impulses and the type-wheel for printing the symbols, are synchronously driven by one shaft. Means for operating a shaft synchronously with arriving electrical impulses are. known in the art. They are for instance disclosed in the U. '8. Patent No. 690,248 of December'31, 1901, to William Duane, and also in the British Patent No. 21304/1903 to Siemens Bros. The illustration and description of such means has therefore been omitted in the present description, so as not to-unnecessarily complicate the disclosure of the principal subject matter of the present invention. In the following description it may be assumed that the shaft V which controls the operation-of the distributing elements is operated synchronously with the arriving impulses in suitable manner, such as shownin the aforesaid patents. In'type-printing receivers of this character known heretofore twosuccessive operations are in general to be distinguished. namely the receiving and storing of the arriving symbols, and the subsequent translation proper of the symbols into typed characters. During the translation of a. symbol anew symbol cannot be received by the receiving apparatus. For this reason, in such apparatusthe line either remains partially unused, or a plurality of receivers which alternately operate for receiving and translating are connected to'the same line.-

Now aprimary object of our invention is Patented Apr. 4, 1916.

Serial No. 644,901.

with the'receiving apparatus while the previously received symbol is being translated, a translating device is provided according to the present invention, which comprises two or more groups of polarized relays. These groups of relays are alternately connected by means of change-over switches with'the receiving device for the impulses and with the translating device. By these means the group of relays connected with the receiving devlce 1s always controlled by the arriving impulses, that is to say, it is used for receiving the arrivingsymbols, while simultaneously the other group which is connected with the printing device, translates the previously received symbols. controlling means, respectively relays, united into onegroup, depends of course The number of entirely upon the number of impulses of which the symbols are composed.

In the accompanying drawing, the invention which, has been reduced to practice is shown in more or less dlagrammatical form in which the translating device consists of two groups of polarized relays,R,, R and R R For a clearer understanding of the invention it is assumed here that each symbol sent over the line L consists only of two impulses which are distinguished only by J the direction of current, so that according to whether two positive or two negative, or one positive and one negative impulse is sent, four difi'erentsymbols can be transmitted. In compliance with this assumption the stationary receiving ring 8, of the receiver has only two segments 7", s, onwhich the brush a slides, which isdirectly connected with the line L, and which rotates synchronously with the transmitter in a manner referred to in the abovementioned patents.

The segments r, s, are connected by way of change-over switches, U1, a either with the two relays R R of one group, or R R, of the other group. Switches 1 1,, 7.6 are operated by means of connecting bar 9. This bar is controlled by a spring f in one direction and by a cam 70, mounted on shaft 2' in the other direction. This latter control is obtained by a rocking lever on pivoted atone end to bar 9 and resting with its other end against cam 76 through the action of spring f. Thus when the elevated cam surface strikes lever m, switches a -n move into a position shown in dotted lines. This changing of switch position takes place after each complete revolution of the brush arm in, at the moment its brush a glides over the insulated portion a of slip ring 8 Accordingly switches a 24 are alternately in the left hand and right hand position during succeeding revolutions of shaft TV. The particular arrangement by which the switches a, n are shifted is immaterial for the present invention, so long as the operation takes place in proper timed relation to the remaining elements of the device, and while we have illustrated a possible way in which this can be accomplished in order to show a complete operating device, we do not claim the particular construction shown as new.

In the position in which the apparatus is shown in the drawings, segment ring 1" is connected with relay R, by way of switch u whereas segment ring 8 is connected with relay R by switch M2 of the same group. The current impulses arriving over the line A and returning to ground E energize sucimpulses arriving during the next revolution of the receiver control and operate armatures a a After the completed revolution the switches u u are thrown over and the cycle of operations commences Simultaneously with the aforementioned adjustment of the relays by the arriving. impulses the printing or translation of the symbol previously received takes place by the properly energized relays; in other words, while one group of the relays is connected with the receiving ring S, of the receiver, the armatures of the other group of relays are thrown into circuit'with'a local battery, which circuit also contains the printing electromagnet D. This electromagnet D attracts its armature (Z and thereby throws the paper strip 3) fed by drum q against the type wheel. y arranged on shaft W, .so that anew.

are provided which simultaneously with:

switches U1, u, are operated by bar 9.

The device for reproducing the symbols consists according to the present disclosure,

essentially of the two additional stationary segment rings 8,, S printing magnet D, the

two mentioned change-over switches 16 ,41 i

and the relay armatures (4- a, or a,,, a, each of which operating when desired. All of the elements operating simultaneously are disi posed in series arrangement with the battery circuit so that the operation of the printing magnet depends upon the bridging of all contacts located inseries.

The translation of the symbols takes place I as follows: In the position shown in the drawings, as has been mentioned already the two relays R R are electrically connected with ring 1 and h y receive successively the impulses arriving over 11118 L whereby V the relays are connected to the ground at one;

pole as shown. armatures a a and their respective contacts On the other'hanchrelayi 90. are connected with the printing magnet D;

by way of switches u in, with battery a circuit, the whole circuit arrangement being." such that it'is only necessary to bridge two I segments on the segment ringsS S, in order to energize the printing magnet and toefi'ect the printing of the symbol in type. This bridging iowever can occur in the position of the relay armatures only at a definite no inent which is characteristic for the special type character, in sofar as it determines-the a angle of rotation of typewheely and thus .7

the placing of the type in printing position;

In the position of theelements shown arma tures a 'aof relays R R, are in contact with the left hand contacts. As can be seen from the diagram these latter contacts are connected with segment 1; of ring S and also with segment 2 of ring 8,. rings glide two brushes'b b, which areelectrically connected with each other and which Therefore a o are also mounted on arm :21.

On these two 7 connection of both relay contacts can-ta-ke place only when segments a and 'v are simultaneously in contact with their respective brushes 6,, 6,, which is the case only during I the last quarter of the revolution ofbru'sh arm m and shaft W. thus made a current can flow from battery B through electromagnet'D, switch a armaswitch a, back to the battery B. The print ing magnet attracts its armature (Z and there? by throws the paper strip ;0 whichis located lVhen connection is a i ".125 between the other end of the armature and the type wheel 'y, against the character which is then presented to; the strip. At thfi cont loo vpletion of th'efrevolution of the brushes on mentioned, by which now instead of'the' armature contacts a, a, of relay group R R ,.now armature contacts 0,,, a of relay group R R are thrown in circuit with printing magnet D. Thus during the next revolution of brush arm a the symbol is translated which corresponds with the armature position of this relay group.

In the practical apparatus it is of course advisable owing to the large number of symbols necessary for transmitting speech and for the reliable transmission of the signals to use not only two impulses for characterizing a symbol, but more, for instance 5 and in this case these impulses are not only distinguished by their character (whether negative or positive) but also by their timely arrival. Within which time an impulse arrives is immaterial, for the present invention. On the other hand, it is essential that within one given time interval during which a symbol arrives, also the translation of the previously received impulse into printed type is effected by means of only one receiving apparatus.

1. In a printing telegraph receiver, a main line, means for receiving and distributing current impulses arriving over said line, a printing mechanism and a working circuit therefor, in combination with a changing over device operated synchronously with said current impulses, and a plurality of groups of adjusting devices and suitable circuit connections therefor and means whereby the single groups of said devices alternatively set the working circuit for said printing mechanism and close the circuit previously set by another group.

2. In a printing telegraph receiver. a main line, means for receiving and distributing current impulses arriving over said line, comprising a fixed and a rotatable element, a printing mechanism and a working circuit therefor in combination with a changing over device, a shaft operated synchronously with said current impulses for operating the rotatable element of said receiving means, and a plurality of groups of adjusting devices and suitable circuit connections therefor and means whereby the single groups of said devices alternatively set the working circuit for said printing mechanism and close the circuit previously set by another group.

3. In a printing telegraph receiver, a main line, means for receiving and distributing current impulses arriving over said line, a type wheel, a printing magnet cooperating therewith, a working circuit for said magnet, and a selector consisting of a fixed and a rotatable. element, in combinationwith a changing over device, a shaft driven synchronously with said current impulses for driving said type-wheel and the rotatable element of said selector, and a plurality of groups of adjusting devices and appertaining circuits therefor and means whereby the single groups of said devices alternatively set the working'circuit for said printingmagnet and close the circuit by another group. r

4. In a printing telegraph receiver, a main line, means for receiving and distributing current impulses arriving over said line and a printing mechanism having a suitable working circuit for operating it, in combination with a changing over device, means for causing it to operate synchronously with previously set said current impulses, and a plurality ofgroups of relays with their operating armatures, the armatures 0f the single groups of said relays having suitable circuit connection and means for alternatively setting the working circuit for said printing mechanism and for closing the circuit previously set by another group.

5. In a printing telegraph receiver, a main line, means for receiving and distributing current impulses comprising a fixed and a rotatable element, a type wheel, a printing magnet cooperating therewith and a suitable working circuit for actuating said magnet, and a selector consisting of a fixed and a rotatable element in combination with two groups of relays with their appertaining armatures and of switches and appertaining circuits therefor the one group of said switches being connected to the fixed element of said receiving means and adapted to control the circuits of said relays, the other group being connected in circuit with said printing magnet, said relay armatures constituting switches having their contact points connected in circuit with the fixed element of said selector, said armatures being connected in circuit with said second group of switches which is in circuit with said printing magnet.

6. In a printing telegraph receiver, a main line, means for receiving and distributing current impulses arriving over said line comprising a fixed and a rotatable element, a type-wheel, a printing magnet cooperating therewith and a suitable working circuit for actuating said magnet, and a selector con rsisting of a fixed and a rotatable element, in

combination with two groups of relays with with their appertaining armatures and of switches and appertaining circuits therefor, the one group of said switches being connected to the fixed element of said receiving means and adapted to control the circuits of said relays, the other group being connected in circuit with said printing magnet,

said relay armatures ccnstituting switches, selecto and foi operating said type-Wheel 1O havlng then" contact polnts connected 1n cirand sand. switches.

cuit with the'fixed element of said selector, In Witness whereof, We hereunto subscribe said armatures being connected in circuit our names. .7 with said second group of'svvitches which is ADOLF FRANKE.

in circuit with said printing magnet, and a ER'WIN EHRHARDT; shaft rotating synchronously with said cur- Witnesses:

rent impulses for driving the moving ele HENRY HAsPER,

ments of said receiving means and of said WOLDEMAR HAUBT.

Copies 01 this patent may be obtained for five cents each, by addressing the Commissioner of Patent! I Washington, D. G. i 

